Collage- is a technique of an art production, primarily used in the visual arts where the artwork is made from an assemblage of different forms, thus creating a new whole.
Sepia toning- Sepia toning is a specialized treatment to give a black-and-white photographic print a warmer tone and to enhance its archival qualities.
Selenium toning- Selenium toning is a popular archival toning process, converting metallic silver to silver selenide.
Duotone- is a halftone reproduction of an image using the superimposition of one contrasting colour halftone (traditionally black) over another color halftone.
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